<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // 下列有什么错误？ 有一处错误
    // const arr = [
    //   {
    //     username: '小明',
    //     age: 18
    //   }
    // ]
    // const { [username, age] } = arr

    const arr = [
      {
        username: '小明',
        age: 18
      }
    ]
    const  [{username, age}]  = arr
      console.log(username, age)
  </script>
</body>

</html>